98 lines
2.4 KiB
Python
98 lines
2.4 KiB
Python
# Convert "arbitrary" image files to rgb files (SGI's image format).
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# Input may be compressed.
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# The uncompressed file type may be PBM, PGM, PPM, GIF, TIFF, or Sun raster.
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# An exception is raised if the file is not of a recognized type.
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# Returned filename is either the input filename or a temporary filename;
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# in the latter case the caller must ensure that it is removed.
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# Other temporary files used are removed by the function.
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import os
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import tempfile
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import pipes
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import imghdr
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table = {}
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t = pipes.Template()
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t.append('fromppm $IN $OUT', 'ff')
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table['ppm'] = t
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t = pipes.Template()
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t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
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t.append('fromppm $IN $OUT', 'ff')
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table['pnm'] = t
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table['pgm'] = t
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table['pbm'] = t
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t = pipes.Template()
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t.append('fromgif $IN $OUT', 'ff')
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table['gif'] = t
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t = pipes.Template()
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t.append('tifftopnm', '--')
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t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
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t.append('fromppm $IN $OUT', 'ff')
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table['tiff'] = t
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t = pipes.Template()
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t.append('rasttopnm', '--')
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t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
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t.append('fromppm $IN $OUT', 'ff')
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table['rast'] = t
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t = pipes.Template()
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t.append('djpeg', '--')
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t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
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t.append('fromppm $IN $OUT', 'ff')
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table['jpeg'] = t
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uncompress = pipes.Template()
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uncompress.append('uncompress', '--')
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error = 'torgb.error' # Exception
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def torgb(filename):
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temps = []
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ret = None
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try:
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ret = _torgb(filename, temps)
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finally:
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for temp in temps[:]:
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if temp <> ret:
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try:
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os.unlink(temp)
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except os.error:
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pass
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temps.remove(temp)
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return ret
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def _torgb(filename, temps):
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if filename[-2:] == '.Z':
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fname = tempfile.mktemp()
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temps.append(fname)
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sts = uncompress.copy(filename, fname)
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if sts:
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raise error, filename + ': uncompress failed'
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else:
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fname = filename
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try:
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ftype = imghdr.what(fname)
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except IOError, msg:
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if type(msg) == type(()) and len(msg) == 2 and \
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type(msg[0]) == type(0) and type(msg[1]) == type(''):
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msg = msg[1]
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if type(msg) <> type(''):
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msg = `msg`
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raise error, filename + ': ' + msg
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if ftype == 'rgb':
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return fname
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if ftype == None or not table.has_key(ftype):
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raise error, \
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filename + ': unsupported image file type ' + `ftype`
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temp = tempfile.mktemp()
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sts = table[ftype].copy(fname, temp)
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if sts:
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raise error, filename + ': conversion to rgb failed'
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return temp
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